This document provides a list of free nautical charts and online publications / Ce document fournit une liste de cartes marines gratuites et d'ouvrages nautiques en ligne.
For navigation use only updated regulatory documents / Pour la navigation n'utiliser que des documents réglementaires à jour.
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An index of 1.5 mean there is a deviation of 150% between the current and the average TEC values.
It is representative of the deviation of current ionospheric conditions from those expected by an usual GPS receiver.
This deviation can cause a position error if it remain uncorrected.
For the real GPS position errors refer to the L1 map below.
S4 Index Ionospheric scintillation occurs when a radio frequency signal traverses a region of small scale irregularities in electron density in the ionosphere.
This is a rapid fluctuation of radio-frequency signal amplitude.
The S4 Index quantified this amplitude scintillation with a measure of the short timescale fluctuation in the signal to noise of a transmission.
Values over 0.6 indicate strong scintillation which can cause loss of lock on a GPS signal.
A scintillation index below 0.3 is unlikely to have any affect on GPS.